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FX3G/FX3U/FX3UC Series Programmable Controllers
Programming Manual - Basic & Applied Instruction Edition
2 Overview (Sequence Program)
2.6 Program Memory and Devices
Caution
Programs (when a memory cassette is not attached), latched (battery backed) type device values and clock
data are not backed up correctly when the battery voltage becomes low due to expiration of the battery life or
another reason.
In such a case, clear latched (battery backed) type devices, transfer programs again (when a memory
cassette is not attached), and then set initial values and clock data if necessary.
→ For a rough guide to the life and replacement of the battery, refer to the respective PLC User’s
Manual [Hardware Edition].
→ For the latched type device initialization method, refer to Subsection 2.6.5.
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